Gas turbine generator plant

ABSTRACT

The present invention relates to a gas turbine generator plant in which, by forming auxiliary equipment, comprising a starter, a lubricating oil device, a control oil device, and a lubricating oil main tank, into a unit, this may be disposed within a building in a unitary manner with a generator and a gas turbine unit.  
     The gas turbine generator plant of the present invention is provided with a generator, a gas turbine unit, and auxiliary equipment, comprising a starter, a lubricating oil device, a control oil device, and a lubricating oil tank; the auxiliary equipment is made unitary, and this unitary auxiliary equipment, the generator, and the gas turbine unit are disposed in that order within a building.  
     By means of this, the installed floor area of the plant is dramatically reduced, and it is also possible to reduce construction costs. Furthermore, the unitary auxiliary equipment can be transported together, so that it is possible to limit all at once the occurrence of rust in auxiliary equipment resulting from salt during transport by sea, if a cover is attached, and the packing is also high-density, so that transportation costs may be reduced. Furthermore, there are also few installation points, so that the installation cost is also greatly reduced in scope. In addition, only a single dedicated crane need be installed to carry out maintenance, and all maintenance of the auxiliary equipment may be easily carried out by installing only this single crane.

BACKGROUND OF THE INVENTION

[0001] 1. Technical Field

[0002] The present invention relates to a gas turbine generator plant in which a generator and a gas turbine unit may be disposed in a unitarymanner within a building by means of making auxiliary equipment, comprising a starter, a lubricating oil device, a control oil device, and a lubricating oil main tank into a unit.

[0003] 2. Related Art

[0004]FIG. 10 is a sketch showing the common arrangement of a conventional gas turbine generator plant. In the figure, reference 80 indicates a gas turbine unit, while reference 81 indicates a generator. Reference 91 indicates a lubricating oil main tank, reference 92 indicates lubricating oil auxiliary equipments disposed above the lubricating oil main tank 91, reference 93 indicates a starter which serves to start the generator 81, and reference 94 indicates a speed reducer which is coupled to the starter 93 and is also coupled to the axle of the generator 81. Reference 95 indicates a fuel oil control unit, while reference 96 indicates a fuel oil pump. The lubricating oil main tank 91, lubricating oil auxiliary equipments 92, fuel oil control unit 95, and fuel oil pump 96 will not be explained in detail; however, the necessary portions thereof are connected with the gas turbine unit 80, the generator 81, and the starter 93 via wiring and piping 82.

[0005] In the conventional gas turbine generator plant having the structure described above, the lubricating oil main tank 91, the lubricating oil auxiliary equipments 92, the starter 93, the speed reducer 94, the fuel oil control unit 95, and the fuel oil pump 96 all have different purposes of use, so that they occupy different positions, being disposed in positions appropriate to the use thereof, and are disposed using the planar space in the vicinity of gas turbine unit 80 and generator 81.

[0006] During the withdrawal of the rotors of the gas turbine unit 80 or generator 81 disposed in planar space in this manner, or during the maintenance of the machinery, it is currently the case that the large parts such as the rotors and the like are manipulated using large scale overhead cranes, or maintenance cranes are disposed at each device. In this type of planar disposition, the floor area of the plant building becomes large, and as a result, transport, installation, and maintenance become complex, and this necessarily involves large increases in cost.

[0007] Furthermore, the following problems are result of such a planar arrangement.

[0008] Since the equipment are arranged in planar fashion, the floor area required for the installation of the plant is large.

[0009] Because the machines are disposed in an individualized fashion, transport is time consuming, and installation is also complex, and this leads to increases in cost.

[0010] Because maintenance cranes are required for each device, the structure of the building is complex, and there is duplication in the equipment.

SUMMARY OF THE INVENTION

[0011] The present invention was developed in order to solve the problems described above; the chief features thereof are that auxiliary equipment comprising a starter, a lubricating oil device, a control oil device, and a lubricating oil main tank are disposed in a compact fashion and made unitary, and this unitary auxiliary equipment can be coupled with a gas turbine unit and a generator in a single unit, so that in an arrangement which reduces the floor area of the building, transport, installation, and maintenance are all simplified and saved in comparison to the conventional technology, and a gas turbine generator plant is provided which is capable of reducing costs.

[0012] The gas turbine generator plant of the present invention is provided with a generator, a gas turbine unit, and auxiliary equipment comprising a starter, a lubricating oil device, a control oil device, and a lubricating oil main tank, and this auxiliary equipment is made unitary, and the unitary auxiliary equipment, the generator, and the gas turbine unit are disposed in that order within a building.

[0013] In the gas turbine generator plant of the present invention, auxiliary equipment comprising a starter, a lubricating oil device, a control oil device, and a lubricating oil main tank is made unitary, so that the floor area required for the plant is greatly reduced, and it is possible to reduce installation costs. Furthermore, the unitary auxiliary equipments can be transported together, so that if a covering is provided, the occurrence of rust on the auxiliary equipments resulting from exposure to salt during sea transport may be reduced all at once, and high compact packing is also possible, so that transport costs may be reduced. Furthermore, the installation points are also reduced in number, so that the number of installation man hour or man power is dramatically reduced. Furthermore, only one dedicated crane need be provided for maintenance, so that maintenance of all the auxiliary equipments may be easily carried out by installing a single crane.

[0014] As described above, by making the auxiliary equipment unitary, it is possible to dramatically reduce the installed floor area of the plant. Furthermore, it is possible to transport the unitary auxiliary equipment together, so that transportation costs may also be reduced. Furthermore, the installation points are also reduced in number, so that it is also possible to reduce installation costs. Additionally, plant maintenance may also be easily conducted by providing a single dedicated crane.

BRIEF DESCRIPTION OF THE DRAWINGS

[0015]FIG. 1 is a top view showing the entire structure of a gas turbine generator plant in accordance with an embodiment of the present invention.

[0016]FIG. 2 is a top view showing the starter/auxiliary equipment unit in a gas turbine generator plant in accordance with an embodiment of the present invention.

[0017]FIG. 3 is a side view showing the starter/auxiliary equipment unit in a gas turbine generator plant in accordance with an embodiment of the present invention.

[0018]FIG. 4 is a side view showing the details of the structure of a gas turbine generator plant in accordance with an embodiment of the present invention.

[0019]FIG. 5 is a side view showing the details of the structure in the vicinity of the starter/auxiliary equipment unit and maintenance crane in a gas turbine generator plant in accordance with an embodiment of the present invention.

[0020]FIG. 6 is a front view showing a ventilation system of the gas turbine enclosure for the gas turbine generator plant in accordance with an embodiment of the present invention.

[0021]FIG. 7 is a side view showing the ventilation system of the gas turbine enclosure for the gas turbine generator plant in accordance with an embodiment of the present invention.

[0022]FIG. 8 is a front view showing the essential parts of a ventilation duct of a gas turbine generator plant in accordance with an embodiment of the present invention.

[0023]FIG. 9 is a cross-sectional view taken along the A-A line in FIG. 8.

[0024]FIG. 10 is a top view showing the entirety of the structure of a conventional gas turbine generator plant.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinbelow, preferred embodiments of the present invention will be concretely explained based on the figures.

[0026]FIG. 1 is a top view showing the entirety of the structure of a gas turbine generator plant in accordance with an embodiment of the present invention. In FIG. 1, reference 20 indicates a starter/auxiliary equipment unit; a starter for starting the gas turbine and auxiliary equipments 22 comprising various auxiliary equipments of the lubricating oil system are disposed on the upper surface of lubricating oil main rank 1. The auxiliary equipments 22 is constructed so as to form a unit with the lubricating oil main tank 1.

[0027] Reference 23 indicates a building; a small maintenance crane 21 is installed on the ceiling thereof, and the maintenance of auxiliary equipments 22, the withdrawal of the rotors of generator 81, and the like, are accomplished by means of this crane 21. As shown in FIG. 4, a intake air system 25 is installed on top of the building roof 23. Furthermore, reference 24 also indicates a building, and within this building, generator 81 and gas turbine unit 80 are disposed so as to be directly connected to one and other. This building 24 is built so that there is a large amount of space above the gas turbine unit 80. Additionally, within this building 24, a large maintenance crane 26 dedicated for the gas turbine is disposed, and by means of this crane 26, the hoisting of the gas turbine rotors and the like during maintenance is accomplished. Reference 50 indicates a foundation.

[0028]FIGS. 2 and 3 show the details of the structure of the starter/auxiliary equipment unit 20 of the gas turbine generator plant in accordance with the present embodiment; FIG. 2 shows a top view thereof, while FIG. 3 shows a side view thereof. In both figures, starter/auxiliary equipment unit 20 involves a starter for the gas turbine and auxiliary equipments 22 comprising various auxiliary equipment of the lubricating oil system such as the lubricating oil device and the control oil device; this is installed on the lubricating oil main tank 1, and is made unitary with the lubricating oil main tank 1, and this unit including the starter is built so as to be connected with the generator 81.

[0029] Hereinbelow, the features thereof will be discussed in detail.

[0030] In FIGS. 2 and 3, reference 1 indicates the lubricating oil main tank, and various devices such as the starter 2, the lubricating oil device 3, the control oil device 4, a gear device 5, and starting motor 6 are provided on the upper surface of this tank 1. Furthermore, reference 7 indicates a turning motor, reference 8 indicates a control oil tank and filter, reference 9 indicates a lubricating oil pumps, reference 10 indicates a lubricating oil filters, and reference 11 indicates the other auxiliary equipments. This auxiliary equipment is also provided on the upper surface of lubricating oil main tank 1, and auxiliary equipment 2 comprises the main devices described above, from starter 2 to starting motor 6, and from turning motor 7 to the other auxiliary equipment 11; this auxiliary equipments 22 is incorporated on a unitary manner on the upper surface of the lubricating oil main tank 1 to form the starter/auxiliary equipment unit 20.

[0031] Reference 15 indicates a soundproofing cover which is attached on the periphery of the upper surface of the lubricating oil main tank 1; this is provided particularly in the case in which starter/auxiliary equipment unit 20 is installed within the building. In the case of installation outside the building, it is possible to employ this covering as a weather proof cover by providing water resistance on the outer surface of the soundproofing cover 15. In such a case, although of course omitted in the figures, the ceiling portion is also covered, so that it is not exposed to the rain.

[0032] As described above, by disposing the auxiliary equipments 22, comprising starter 2—starting motor 6 and turning motor 7—other auxiliary equipment 11, on the upper surface of the lubricating oil main tank 1, a compact starter/auxiliary equipment unit 20 is formed, and thereby, it is possible to greatly reduce the floor area of the plant. Furthermore, it is also possible to reduce the cost involved in transport and installation, and maintenance may be accomplished with a single crane, so that it is possible to greatly reduce the total costs involved in the construction of the plant, transport, installation, and maintenance.

[0033]FIG. 4 is a detailed side view of a gas turbine generator plant in accordance with the present embodiment. In the figure, a building 23 and building 24 are provided on a foundation 50; building 23 is lower than building 24, and a intake air system 25, which conducts air suction of the gas turbine, is provided on the upper part thereof. Generator 81 and the starter/auxiliary equipment unit 20, which is depicted in FIGS. 2 and 3 and is directly connected thereto, is installed within building 23. A small maintenance crane 21 is installed in the ceiling of the building 23, and the maintenance of auxiliary equipments 22, and the withdrawal of the rotors of generator 81, is conducted by means of this crane 21.

[0034] The roof of building 24 is higher than the roof of building 23, and a large maintenance crane 26 is installed in the ceiling of this building 24. Gas turbine unit 80 is disposed within this building 24, and the hoisting and lowering of gas turbine rotor 27 is conducted by means of this large maintenance crane 26.

[0035] As described above, a large maintenance crane 26 and a small maintenance crane 21 are used in a dedicated fashion, so that it is possible to use a small lightweight maintenance crane 21 and the roof of building 23 may be made lower than the roof of building 24, and a shortening is also possible in the axial direction. Furthermore, a intake air system 25 is installed on the roof part of building 23, so that the arrangement is compact, and it is possible to minimize loads resulting from wind, earthquakes, and the like.

[0036]FIG. 5 is a side view showing the starter/auxiliary equipment unit 20 and maintenance crane 21 portions in the present embodiment; as shown in the figure, the small maintenance crane 21 is disposed in the building 23, and auxiliary equipments 22, comprising starter 2 and the like, is disposed on the upper surface of lubricating oil main tank 1 and is made unitary therewith, producing starter/auxiliary equipment unit 20.

[0037] When the rotors of generator 81 are withdrawn, the cover is removed using maintenance crane 21, and the upper half of the lubricating oil equipments on the lubricating oil main tank 1 is dismantled, and hooks are attached to the rotors of generator 81 using crane 21 from the side of lubricating oil main tank 1, and these are then moved in the axial direction and draw out.

[0038] As described above, in the gas turbine generator plant of the present embodiment, auxiliary equipments 22 including a starter 2 is disposed on the upper surface of the lubricating oil main tank 1, forming a starter/auxiliary equipment unit 20, and this starter/auxiliary equipment unit 20 and a generator 81 are disposed within a building 23, and furthermore, a dedicated small maintenance crane 21 is disposed at the ceiling of building 23, while a intake air system 25 is disposed on the upper part of the roof thereof. The roof of building 24 is higher than the roof of building 23 and gas turbine unit 80 is disposed therein, while a large maintenance crane 26 is installed in the ceiling thereof, and the plant setup is conducted in the following order: starter/auxiliary equipment unit 20, generator 81, gas turbine unit 80.

[0039] By conducting the installation in this manner, it is possible to make the roof of building 23, which houses the starter/auxiliary equipment unit 20 and generator 81, lower, and by installing the intake air system 25 on the upper part of the roof thereof, a shortening in the axial direction is also possible, and it is also possible to reduce the floor area. Furthermore, the auxiliary equipments 22 is installed on the upper surface of the lubricating oil main tank 1 to form the starter/auxiliary equipment unit 20, so that auxiliary equipments 22 is made unitary, and transport, installation, and maintenance become simple, so that a cost reduction is achieved. Furthermore, dedicated cranes are employed, and thereby, it becomes unnecessary to install maintenance cranes for each piece of auxiliary equipment or device, and it is possible to execute all operations relating to maintenance using the small crane 21 and the large crane 26.

[0040] It is possible to reduce the maintenance crane 21 in size, so that the crane as a whole may be made small and light. If the crane can be made light, it is possible to make the crane girder thin, and to reduce the size of the crane beam. As a result, it is not merely the case that the crane becomes inexpensive; the motor capacity is also reduced, so that the power lines and instrument wiring also are made thinner, and installation thereof becomes a simple matter.

[0041] Since crane 21 is small and lightweight, it is possible to lower the roof of building 23. Accordingly, it is possible to reduce the amount of wall material of building 23, and thus to achieve a reduction in cost. Furthermore, it is possible to make the building construction materials thinner by the amount of the load ratio of crane 21. When the building construction material is made thinner, the effective space within the building is also increased. Furthermore, it is also possible to reduce the load with respect to wind and earthquakes on the intake air filter and silencer which are provided on the roof thereof.

[0042] Furthermore, by providing the starter 2 on the lubricating oil main tank 1, it is possible to shorten the axial direction of building span of the starter 2 side within building 23. A reduction in the span of the building piller results in a large reduction in cost of the roof and the building construction material. In other words, it is possible to make the beams thinner. Furthermore, the cable trench in the rear of starter 2 is also shortened. This allows a reduction in the concrete volume, and a shortening of the cable length. Furthermore, the intake air ducts may also be shortened, and the weight thereof may be reduced, so that the design of the building is simplified.

[0043] By means of the gas turbine generator plant of the present embodiment, the auxiliary equipment is made into a unit, and thereby the installed floor area of the plant may be dramatically reduced, and the unitary auxiliary equipment may be transported together, so that transport costs can also be limited, and there are few points of installation, so that it is also possible to reduce installation costs. Furthermore, maintenance may be easily conducted by installing dedicated cranes.

[0044] Furthermore, the roof of the building housing the gas turbine unit is made high, and the roof over the generator and the unitary auxiliary equipment is made low, and thereby, it is possible to install a large crane and a small crane; the rotors of the generator may be maintained using the small crane, while the rotors of the gas turbine may be maintained using the large crane. For this reason, the building in which the small crane is installed may be reduced in weight, and it is possible to achieve a cost savings.

[0045] Furthermore, by providing a intake air system on the lower roof, it is possible to further reduce the installed floor area of the plant.

[0046] Furthermore, when the auxiliary equipments is made unitary, the starter, control device, and lubricating oil device are provided on the upper surface of the lubricating oil main tank, and thereby, the density of the unit becomes higher, and this is effective in reducing the installed floor area and in lowering the costs of transport, installation, and maintenance.

[0047]FIG. 6 is a front view showing the ventilation system of the gas turbine enclosure for the gas turbine generator plant described above, while FIG. 7 is a side view of this ventilation system. The actual size of this apparatus can be understood from a comparison with the human being 78 having a height of 180 cm depicted in the figure.

[0048] In both figures, in order to prevent the external propagation of the large amount of noise produced by the gas turbine and containing suction noise, combustion noise, exhaust noise, and rotational noise and the like, a soundproof cover 61 is provided so as to enclose the entirety of a casing, not depicted in the figure, at the outer periphery thereof; this casing contains rotating blades, rotors, and the like operated by high temperature combustion gas, and has attached to the inner side thereof a labyrinth and stationary blades disposed so as to provide a predetermined gap with the chips of the rotating blades.

[0049] Furthermore, three suction ducts 63 are attached to the top part of the soundproof cover 61; these form branching ducts, one end of which communicates with the interior of soundproof cover 61, the other end communicating with the suction port of fan 62. The suction ducts 63 exhaust and ventilate the amount of air which must be exhausted from within the soundproof cover 61 (hereinbelow referred to as the amount of ventilated air) in order to maintain the temperature within the soundproof cover 61, the temperature of which rises as a result of heat radiating from the outer circumferential surface of the casing, at approximately 60C.

[0050] The three suction ducts 63 which permit the soundproof cover 61 to be coupled with the fan 62, and which send the air within the soundproof cover 61 to the suction port of fan 62, commonly provide for the sufficient exhaust of the amount of ventilated air and the ventilation of the interior of the soundproof cover 61, without increasing the flow rate, using any two of the three suction ducts 63. Here, even when ventilation of the interior of the soundproof cover 61 is conducted using any two of the three suction ducts 63, the ventilation of the entire area within the soundproof cover 61 is conducted approximately uniformly, and a position is selected such that localized increases in temperature do not occur, and the ducts are coupled to the top part of soundproof cover 61.

[0051] The cross-sectional area of the three section ducts 63 is set to a size enabling a flow rate of the exchanged air which, when 50% of the capacity of the amount of ventilated air is caused to flow, avoids the undesirable effects caused either as a result of an increase in air resistance and the need for increasing in the delivery pressure of fan 62 when the flow rate of the ventilated air increases, or the generation of noise as a result of the air passing therethrough.

[0052] Furthermore, the fans 62, which are interposed in the suction ducts 63 coupled to the soundproof cover 61 and which exhaust the heated air within the soundproof cover 61, have a fan capacity which is 50% of the amount of ventilated air described above, and three such fans are disposed in parallel; during operation, two of these three fans are used in normal operations, while the other remains in a stand-by condition as a reserve unit having incorporated thereinto a sequence permitting immediate operation when a fan malfunctions during operation.

[0053] Furthermore, the delivery pressure of the fans 62 is set at the extremely low level of approximately 20 mm Aq, and although the delivery amount is large, the fan capacity is small, and it is thus possible to reduce running costs.

[0054] In other words, as described above, the cross-sectional area of the suction ducts 63 is made large, and the cross-sectional area of the ventilation ducts 65 described hereinbelow is also made large, and the flow path resistance is reduced, and thereby, the ventilation of the interior of the soundproof cover 61 can be sufficiently conducted even when fans 62 having an extremely low delivery pressure are employed.

[0055] Furthermore, the motors 71 driving fans 62 which are employed may be ones in which, where necessary, an explosion proof motor has been used.

[0056] Furthermore, the three exhaust ducts 64 which are disposed in parallel at the exhaust ports of fans 62 and form a branched duct in a similar manner, flow together and become one at a position which is, as may be surmised from the height of the person 78 depicted in the figure, approximately 3 meters higher than the exhaust ports of the fans 62.

[0057] The ventilation duct 65 formed by the three exhaust ducts 64 is provided in an upright manner along the side wall of building 24 and extending to the roof of building 24, in which gas turbine unit 80 is disposed, in order to comply with regulations concerning the prevention of explosions.

[0058] Furthermore, as shown in FIGS. 8 and 9, the ventilation duct 65 has, to outward appearances, the rectangular shape of a single duct; however, it is provided with vertical partitions 67 in its interior, and the duct is thus divided into three flow paths 72 having a cross-sectional area such that, when an amount of ventilated air which is 50% of capacity is caused to flow, the flow rate is such that the flow path resistance does not increase; these flow paths 72 are coupled with the specific suction ducts 63 and fans 62.

[0059] In other words, the air exhausted from within the soundproof cover 61 flows independently, at 50% of the capacity of the amount of air ventilated, through two of the three flow paths which cover the entire length from the entrance to the suction duct 63 to the exit from the ventilation duct 65, and this air is then exhausted to the exterior. Furthermore, as a method of preventing the entrance of rain water into the exit part of the ventilation duct 65, the lead end part thereof is formed with a shape bent downward slightly from the horizontal, as shown in the figure, and a bird screen or the like is installed, and measures are taken for the prevention of the entry of foreign objects and for the prevention of rust, and thus the interior part of ventilation duct 65 is protected.

[0060] Furthermore, the lead end part of ventilation duct 65 may be turned freely in any direction in accordance with the conditions..of the view of the region in which building 24 is erected.

[0061] The ventilation system 75 of the soundproof cover has a structure in which a gas turbine engine, soundproof cover 61, suction ducts 63, fans 62, exhaust ducts 64, ventilation duct 65 and building 24 are connected in a complex manner, so that with respect to phenomena such as earthquakes, vibration, and uneven subsidence, and the like, and particularly with respect to uneven subsidence, it is difficult to estimate which part will subside, so that provisions are made for making plus/minus adjustments in the base plate of fans 62.

[0062] As a method for compensating for the incongruities arising from such phenomena, methods have been considered such as the use of separation measures in which expansions 68 are provided at the entry and exit of fans 62, and the installation of shut off dampers, not depicted in the figure, for use during the operation of extinguishing devices.

[0063] Furthermore, the provision of shut off dampers on the suction port side of fans 62 allows 50% of the ventilated air exhausted from within the soundproof cover 61 described above to pass independently through each of two flow paths 72 among the three flow paths 72 existing from the entry of suction ducts 63 to the exit from ventilation duct 65, and allows this air to be exhausted to the exterior, and in addition, even during the operation of the gas turbine, this has the advantage of permitting the maintenance, inspection, and reconditioning and the like of, in particular, the fans 62, which have a high trouble frequency.

[0064] A hoist 69 is provided at a height facilitating maintenance of fans 62, such as the overhaul and inspection there of, and additionally, and a duct arrangement is considered which forms “the normal height” installation in commercial gas turbine facilities, so that a walk-way 70 is provided and regular patrols can be made from the ground level to the installation points, and thus access which is not different from that of standard machinery installed above ground is contemplated. For this reason, general overhaul and inspection may be conducted on-site, and where further overhaul and inspection is required, it is possible to convey the machinery to the ground level.

[0065] In other words, in general, inspection or maintenance of machinery installed at high positions is conducted by readying a truck crane each time such an operation becomes necessary, and the access of standard installations is such that installation costs are high, so that a provided hoist 69, a walk-way 70, and the like are generally not provided; however, in the ventilation system provided of the gas turbine enclosure in the present embodiment, such hoists and walk-way are extremely important in order to achieve continuous operation of the gas turbine, and there is not a feeling of fear at being at a high place during inspection and maintenance, and operations can be conducted with the feeling that one is standing on the earth, so that a hoist 69 and a walk-way 70 are provided, and access and good operating characteristics are provided.

[0066] By means of this ventilation system of the gas turbine enclosure, the maintenance of one of the fans can be conducted freely and easily during operation of the gas turbine, and by conducting a fan actuation operation having a sequence in which a back up fan is immediately started up when one of the fans fails down, operation is possible in which 100% of the capacity of the amount of ventilated air can be guaranteed in all cases. Accordingly, it is possible to always maintain the interior of the soundproof cover at or below an acceptable temperature, and it is thus possible to prevent deformation in the casing. By means of this, it is possible to completely prevent the occurrence of problems accompanying casing deformation which make emergency stoppage of the gas turbine inevitable, and to avoid the occurrence of serious accidents.

[0067] Furthermore, it is possible to reduce the installed range of the ducts, and furthermore, in order to prevent the mutual interactional rotation of the fan exhaust air, it is no longer necessary to provide check valves, switching dampers, or the like, at the fan exits, and compactness is thus achieved, and a reduction in weight and low cost become possible.

[0068] Furthermore, the operation, maintenance, and inspection of the gas turbine becomes easy, and even during fan failer, recovery is possible without stopping the gas turbine, and this makes the continuous operation of the gas turbine possible. Furthermore, installation is conducted at a high position, so that consideration is given to operation and safety, and the overall combination is superior.

[0069] Accordingly, depending on the type of gas turbine, temperatures may reach 150° C. or above, and it is necessary to employ various measures to prevent the deformation of the casing, while at the exhaust end, coolers and the like are required, while in contrast, in this ventilator of the soundproof cover, the air within the soundproof cover can be exhausted using a small fan capacity, and it is easily possible to maintain the temperature within the soundproof cover at the acceptable temperature of 60° C. or below. 

What is claimed is:
 1. A gas turbine generator plant provided with: a generator, a gas turbine unit, and auxiliary equipment comprising a starter, a lubricating oil device, a control oil device, and a lubricating oil tank, wherein: said auxiliary equipment is made into a unit, and said unitary auxiliary equipment, said generator, and said gas turbine unit are disposed in that order within a building.
 2. A gas turbine generator plant in accordance with claim 1, wherein in said unitary auxiliary equipment, said starter, lubricating oil device, and control oil device are disposed on said lubricating oil tank and made unitary.
 3. A gas turbine generator plant in accordance with claim 2, wherein a soundproof cover is provided about said unitary auxiliary equipment.
 4. A gas turbine generator plant in accordance with claim 1, wherein the roof of said building is such that the roof above said gas turbine unit is higher than the roof above said unitary auxiliary equipment and said generator.
 5. A gas turbine generator plant in accordance with claim 4, wherein maintenance cranes are provided within said building at the side of said gas turbine unit and at the side of said unitary auxiliary equipment and said generator.
 6. A gas turbine generator plant in accordance with claim 4, wherein a gas turbine suction means is provided on the lower roof of said building.
 7. A gas turbine generator plant in accordance with claim 1, wherein in a soundproof cover enclosing said gas turbine unit, in order to reduce the noise generated by said gas turbine unit, a ventilator within a soundproof cover, for ventilating the interior of said soundproof cover, limiting temperature increases therein, and maintaining the interior at an allowed temperature or below, is provided.
 8. A gas turbine generator plant in accordance with claim 7, wherein said ventilator within a soundproof cover comprises: three branched ducts, which are coupled at a position separated from said soundproof cover and which independently exhaust air within said soundproof cover, fans, interposed in said branched ducts, each having a capacity capable of exhausting, from within said soundproof cover, approximately half the air required to maintain the temperature within said soundproof cover at an allowed temperature or below; and a ventilation duct, into which said branched ducts merge and become unitary on the downstream side of said fans, which is provided in a vertical fashion to a point above the building in which said gas turbine is disposed, and in which partitions are vertically provided which form compartments coupled with, respectively, said branched ducts.
 9. A gas turbine generator plant in accordance with claim 8, wherein the cross-sectional area of said 3 branched ducts is set so as not to increase the delivery pressure of said fans.
 10. A gas turbine generator plant in accordance with claim 8, wherein a shut off damper is provided on the suction port side of said fans. 